tiny.smg.scan.source_metadata

1pub const source_metadata = @import("source.zig");

1//! Exact source evidence shared by language scanners.23const std = @import("std");45const smg = @import("../root.zig");6const api = smg.api;7const model = smg.model;89pub fn spanMetadata(10    allocator: std.mem.Allocator,11    base: []const model.Pair,12    source: []const u8,13    span: api.SourceSpan,14) ![]const model.Pair {15    std.debug.assert(span.start_byte < span.end_byte);16    std.debug.assert(span.end_byte <= source.len);17    const updates = try allocator.alloc(model.Pair, 3);18    updates[0] = try integerPair(allocator, api.source_start_byte_key, span.start_byte);19    updates[1] = try integerPair(allocator, api.source_end_byte_key, span.end_byte);20    const digest = api.sourceDigest(source[span.start_byte..span.end_byte]);21    const encoded = std.fmt.bytesToHex(digest, .lower);22    updates[2] = .{23        .key = try allocator.dupe(u8, api.source_hash_key),24        .value = try allocator.dupe(u8, &encoded),25    };26    return try model.mergePairs(allocator, base, updates);27}2829fn integerPair(30    allocator: std.mem.Allocator,31    key: []const u8,32    value: anytype,33) !model.Pair {34    return .{35        .key = try allocator.dupe(u8, key),36        .value = try std.fmt.allocPrint(allocator, "{d}", .{value}),37    };38}